1. First Program
TL;DR (5 lines)
- Read the core idea first.
- Understand one concept at a time.
- Run small examples.
- Fix errors early.
- Move to next chapter only when clear.
Frequent mistakes
- Skipping prerequisites.
- Reading without trying examples.
- Fixing too many errors at once.
Prerequisites: book/poche/00-how-to-read.html. See also: book/chapters/01-starting.html.
Goal
Run a program that returns a value.
Example
entry main at app/demo {
return 0
}Why it matters
This pattern is the basis for all the following exercises.
Quick check
What happens if you replace 0 with 1?
Try this
- Copy the snippet.
- Compile.
- Check the return.
If you're stuck
The code above is sufficient: it is valid, readable and executable.
See also
Next best action
Apply one idea from this chapter in a tiny example, then continue.